I think lots of the complaints against the carbine originate from this reason. I have read reports that G.I.'s complained that the .30 carbine cartridge was so under-powered that it wouldn't penetrate the cold weather clothing the Chinese were wearing at "Chosen"...and at 400 yrds I might believe them but I can tell you that my carbine will penetrate a deer side-to-side at 100 yrds without fail, within their originally "planned for" operational usage they would be completely suitable for me to carry.